what about other objects from krypton that are not organic, ie, metal, cloth, glass, etc. are they indestructable as well?
I remember reading an older superboy comic where he and martha took some glass from his crashed ship, and made lenses for his glasses so he could use his x-ray vision while wearing them without melting them.

I was just wondering if the same thing still applied today in modern comics.

In the recent "Secret Origin" by Geoff Johns, Martha does make Clark glasses using material from his spaceship, so that he can control his heat vision.